It is often claimed that Ashkenazi Jews in the U.S. and the UK are the smartest ethnic group in the world:
http://www.sciencedirect.com/science/article/pii/S016028960600033X
http://www.sciencedirect.com/science/article/pii/S0191886903000795
http://www.ynetnews.com/articles/0,7340,L-4098351,00.html
http://www.israelnationalnews.com/News/News.aspx/131053
http://harpending.humanevo.utah.edu/Documents/ashkiq.webpub.pdf
Is this true?